Charax is a genus containing several species of South American tetras, including the glass headstander, C. gibbosus. These fish, among other characteristics, are small and have a rhomboid shape. Some species are semi-translucent. Species There are currently 16 recognized species in this genus: Charax apurensis C. A. S. de Lucena, 1987 Charax caudimaculatus C. A. S. de Lucena, 1987 Charax condei Géry & Knöppel, 1976 Charax delimai Menezes & C. A. S. de Lucena, 2014 Charax gibbosus Linnaeus, 1758 (Glass headstander) Charax hemigrammus C. H. Eigenmann, 1912 Charax leticiae C. A. S. de Lucena, 1987 Charax macrolepis Kner, 1858 Charax metae C. H. Eigenmann, 1922 Charax michaeli C. A. S. de Lucena, 1989 Charax niger C. A. S. de Lucena, 1989 Charax notulatus C. A. S. de Lucena, 1987 Charax pauciradiatus Günther, 1864 Charax rupununi C. H. Eigenmann, 1912 Charax stenopterus Cope, 1894 Charax tectifer Cope, 1870 References Characidae